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| Patents for Fred Kemper | |||||
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| Number | Date | Patentee | Title | Type | |
| 403,978 | May 28, 1889 | W.W. Roovers, P.G. Williams | Coin released spirometer | ||
| 412,952 | Oct. 15, 1889 | C. Elterich | Tap and holder therefor | taps and dies | |